Steam-boiler.



J. T. NIGOLSON.

STEAM BOILER. APPLICATION FILED APR. 22, 1910.

Patented Sept. 12, 1911.

2 SHEETS-SHEET 1.

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J1 T. NIGOLSON.

STEAM BOILER.

APPLICATION FILED APR. 22, 1910.

1,003,059. Patented Sept. 12,1911.

2 SHEETS-SHEET 2.

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' Jhn T/zomczs W c olfion JOHN rnonns ZNIGOLSON, or mnnrnn, ENGLAND.

STEAM-BOILER.

Specification of Letters Patent;

Patented Sept. 12, 1911.

Application filed April 22, 1910. Serial No. 556,934.

To all whom it my concern:

Be it known that I, JoHN THOMAS NICOL- son, D. So, a subject ofGreat Britain, residing at Marple, inthe county of Chester, England, have invented certain new and useful Improvements Relating to Steam- Boilers,'of which the following is a specification.

This invention relates to steam boilers of the water tube type and has for its object to provide for great steaming capacity with simplicity and convenience in construction and economy both of fuel consumption and of space occupied by the boiler.

On the accompanying sheets of explanatory drawings :-Figure l is a sectionah side elevation of one form of boiler (with oil burning furnace) as constructed in accordance with this invention. Fig. 2 is a sectional side elevation, illustrating another form ofthe boiler having a furnace adapted for burning coal or solid fuel.

The same reference letters in the two views indicate the same or similarparts.

Referring to Fig. 1, three nests of tubes 0 b and c are employed, each nest consisting of a rectangular group of numerous straight small bore tubes with an inolosing flue. The lower ends of the tubes forming the nest a are connected to the drum or chamber d and the upper ends to the drum or chamber e. Similarly the ends of the tubes of the nest b are connected to the drums and respectively, and the ends of the tubes of the nest 0 to the drums g and It respectively. The feed water is admitted to the drum d and passes therefrom through the tubes of nest a to the drum 6. ,As it thus flows through the interior of the said tubes the water is heated by the hot gases flowing, in a contrary direction, along the exterior surfaces of the tubes and parallel therewith; the water is thereby raised to boiling point.-

From the drum e the boiling feed is led into the settling or interception drum 7' by way of the pipe or conduit is. In the said drum j the hot water is in a state of quiescence and in such state any mud or solid matter will separate from the water and become deposited in the drum from whence it may be readily removed thro h mud holes wh1ch are provided with detachable covers in any ordinary manner. The quiescence of the water in the drum j is insured by the provision of lon perforated pipes as Z and m respectively or the entry and egress of the water.

From the interception drum the hot water passesthrough the pipe or conduit a to the drum f and from thence by way of the tubes of the nest b to the drum 9'. In passing through the interior of the said tubes the hot water is subjected to the heat of the hot gases flowing along the exterior surfaces of the tubes and parallel therewith and is thereby evaporated. The saturated steam thus produced flows on from the drum 9 by way of the tubes of the nest c to the drum h and while so passing through the said tubes it becomes superheated by the hot gases flowing along the exterior surfaces of the tubes and parallel'therewith. The superheated steam is withdrawn as required through the outlet or stop Valve 0.

The complete course of .the hot gases flowing in series through the respective tube nests (on the exterior of the tubes) between the furnace p (with combustion chamber g) and the fan ris indicated by the arrows 1; similarly the course of the water and steam as it flows in series through the tube nests ,(within the tubes) between the admission drum (1 and the outlet valve 0, is indicated by the arrows 2. Both of the said flows are at high velocities, the gases under the action of the fan r and the water under the action of the feed pump a. The said fan and pump and also the auxiliary water circulating pump t are driven by the steam turbine at. The fan iscoupled directly to the turbine; the pumps are operated through worm gearing. The purpose of the auxiliary water circulating pump t is to return unevaporated water from the drum 9 to the drum 1.

The rate of steam generation can be instantly varied by throttling the pressure of the steam supply to the turbine u.

Referring to Fig. 2 the boiler there shown water drum," a' sjteam-and-water drum, an,

for the combuse no protisibn alting e steam ,geiier etwee the interception ceurse of the ha g se be- P] ween i 5?? 13 5 1 n 3 cate'd bytl ws any the comeamisindi- 2 a Ving'thus "bed my invention, what I @1 m ss ew desire a s cure 'by'Lf tl- 1 t m g ner to in mbln tien; two ater'dru nest of watertubes c0111- necting said t ,er' drum an I1C l0 S 1Ilg flue are 51 said ne t of"ti1bes,"- an' intereeptif n i I, eutof{theipathofthe-hot a'fi i'i id bQ Wf n fi of 13 1 'drumskan'd "sa nrterception chamber, a a further water flrum, a wa ter conduit between {the latter dSaid interception chambe'r,"a steam-and-wjater drum", a nest "of tubes connecting said steam-and wa'ter drum' with said further waterdrum, and an inclosing flue around the {latter nest of tubes,"as set forth, v a

-2. In steam generators, in combination, a

interception drum out of the path of the hot gases, a nest ofwater' tubesld'eliverihg water from said water drumto said interception drum wherein it.'remain s quiescent, an inclosing flue :for said nest of water tubes, a furnace, further water tubes passing in part through said furnace and delii ering the water from the interceptiondrum"to the steam-and-water drum a'n'inqlosing-flue for a .part'o'f the length of said watertubes between the furnace and the Steam-and Water drum, means for causing the hot gases after passing over the tube surface within the furnace to flow at high speed in series through the tube nests and their inclosing flues in contact and in parallel with the tubes, and meansfor causing a high speed flow of the water throughfthe tubes, the water flow in one nest'being in a counter: direction to the gas flow through that nest, as set forth.

3. In steam generators, in combination,

two water drums, a nest of water tubes 0 connecting said water drums, an inclosing flue around said nest of tubes, an interception drum or chamber out of the path of the hot gases, a water conduit between one of said drums and said intcmeption chammosque her, a furnace, a further water drum, a waterconduit passing"through said furnace nd a ses in the latter arm with the interception chamber," a steam-and-water around said nest oi tubes, an i iteree tion drumbnchamber out of the path 0' the hot gases, a water donduit between one of ssid'erums and said interception chamber, a "furnace, afurthe'r water drum, 9, water conduit passing through said furnace and connecting the latter drum with the interceptionchamber, a eteam-and-water drum, a nest of tubes connecting said steam-andwater drum with said further water drum, an inclosing flue around the latter nest of tubes, means for causin the hot gases from the furnaceto flow at igh speed in series through the said tube nests in contact and in parallel with the tubes, and means for causing a high speed flow of the water through the tubes-the water flow in one nest being in a counter direction to the gas flow through that nest, as set forth.

5. In steam generators, in combination, two water drums,a nest of water tubes connecting said water drums, an inclosing flue around said nest of tubes,'an interception drum or chamber out of the path of'the hot ases, a water conduit between one of said rums and said interception chamber, a furnace, a further water drum, a water conduit passing through'said furnace and connecting the latter drum with the interception chamber, a steam-and-water drum, a nest of tubes connecting said steam-and-water drum with said further water drum, an inclosing fiuc around the latter nest of tubes, and means for drawing water from said steam-andwater drum and deliverin same to said further Water drum, as set orth.

6. In steam generators, in combination, two water drums out of the 'path of the hot gases, a nest of water tubes connectin said drums, an inclosing flue around sai nest of tubes, an interception drum or chamber out of the path of the hot gases,'a water conduit between one of said water drums and the lower portion of said interception chamber, a furnace, a further water drum supported within said furnace, a nest of water tubes passing through said furnace and delivering water from the upper part of said interception chamber tosaid further water drum, a steam-and-water drum, a nest of tubes connecting said steam and watcr'drum' with said further water drum, an inclosing flue around the latter nest of chamber, and means for circulating heating tubes, means for circulating the Water in In testimony whereof, I afiix my signaseries though the said tube nests and also ture in presence of two witnesses. v the said Water drums and interception JOHN THOM AS NIGOLSON.

' gases in series through the nests, the flows Witnesses:

of. the gases and of the water in One nest EDWARD MARKS, being counter-current, as set forth. ARTHUR HUGHES. 

